In August 2015, fuel in Belgium averaged €1.291 for petrol

Petrol, monthly average€1.291/L
Diesel, monthly average€1.148/L
LPG, monthly average€0.416/L
Weekly bulletins held for August 20155

Monthly averages for Belgium across August 2015, from the stored EU Weekly Oil Bulletin monthly history (European Commission, CC BY 4.0).